Question about 2001 Mazda MPV
Heaters working rear is hot and the front stays cold , bothe front and rear operating knobs appear to be ok
Best case is you accidentally left the AC switch on... Check for pinched/bent hoses near firewall of passenger side. Worst case is the heater core is clogged. In this case someone can backflush the heater core to clear it. Good luck!
Posted on Jun 10, 2015
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Posted on Jan 02, 2017
My bet is that there's a relay at fault... but first: have you checked the fuses? the high blower speed draws a lot of power, so sometimes it's fused separately from the other speeds. This means that your fuse for the slow blower speeds could be blown. Also, because theblower draws so much power, you'd need a HUGE switch to switch it directly, so they use a low-power switch inside the car, and a relay (usually under the hood, but sometimes under a seat (check your owner's manual) to do the heavy work. These are often split the same way, with the high blower on one, and the slow on the other. These are the things that are easier to check, but it could just be that the switch is bad. Mid 90s Land rovers and Range Rovers have the same problem, where the only blower speed that works is HIGH, making the cabin sound like a wind tunnel... Just the switch. The switch can be a pain to replace if you do it yourself, but do check the fuses first, and see if you can find the relays. if the fuses are okay, and you find the relays, try to find the one that's for the fan and swap it out, it shouldn't be more than 3-4 dollars from an auto parts store, just bring in the old one to match it, or swap it for another relay that's nearby and has the same pins. If the swap works, just remember to get another relay, because the one you "borrow" from another circuit could be the door locks or the headlights or something else important....
Posted on Jun 22, 2009
Hot air is dependent on the coolant temperature and the heater core.
There are several things that can cause your problem. The easiest to
check is the coolant level in the radiator\reservoir. There must be
enough coolant to flow freely between the engine and the heater core.
The next is the thermostat. If the thermostat is not closing it would
prevent the the coolant from reaching a high enough temperature to
allow for hot air. The thermostat is not expensive or difficult to
replace. The third thing is a blockage in the heater core. Flush the
coolant system properly can sometimes take care of this. If it does not
the only alternative is a new heater core.
Hope this helps.
Posted on Sep 12, 2009
It sounds to me like you have a plugged heater core, or one that is beginning to plug. With the engine running, carefully feel the two hoses that lead from the engine into the heater core in the firewall. If one of those hoses is colder than the other one then you heater core needs to be replaced. This involves removing a bunch of stuff under the dash. Sometimes it's pretty easy and sometimes not. Start by removing the glove box and you should be able to see the plastic housing for the heater core.
Posted on Dec 15, 2009
SOURCE: 2004 Mazda RX8 Heater problem
There is a well known problem that is a manufacturer's defect with the soldered connection on the circuit board behind the temperature knob. There is a fix to re-solder the connections but the dealer will gladly take $450 to replace it with the same bad board that will last you a while. Look for the link to show you how to fix it yourself.
Posted on Dec 19, 2009
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